RU2198419C1 - Gear to cool electron boards - Google Patents

Abstract

FIELD: electrical engineering. SUBSTANCE: given gear can be utilized to ensure required thermal conditions of radio electronic hardware, electron boards, in particular. Technical result of invention consists in increased efficiency of cooling of electron boards due to elimination of heat transfers creating additional thermal resistance between electron board and junctions of cascade thermoelectric battery. Cascade thermoelectric battery is made of thermal elements with branches of different height, branches of maximum height are brought into thermal contact with electron board with heat release elements by heat absorbing junctions. Additional thermoelectric batteries are positioned on heat absorbing junctions of thermal elements on branches of lesser height. Gear is so arranged that heat absorbing junctions of thermal elements of base cascade with maximum height of branches are at one level with heat absorbing junctions of terminal cascades of additional thermoelectric batteries. EFFECT: increased efficiency of cooling of electron boards. 1 dwg

Description

 The invention relates to electronics and can be used to provide the required thermal conditions of the elements of electronic equipment, in particular electronic circuit boards.

 The prototype of the device is the device described in [1], containing a thermoelectric battery, a heat exchanger. In it, the thermoelectric battery has a cascade design, in which the lower base cascade provides a predetermined temperature regime for the areas of the electronic circuit board with heat-generating elements having the lowest dissipation power, and the upper additional cascades located under the heat-generating elements of the electronic circuit board with high dissipation powers provide additional heat removal, the magnitude which is determined in accordance with the level of power dissipation of a specific fuel element. The thermal contact of the heat-absorbing junctions of the cascade thermoelectric battery with the areas of the electronic board is carried out by heat transfers made of highly heat-conducting material.

 The disadvantage of this device is the presence of heat transitions that create additional thermal resistance between the cooling object (areas of the electronic board) and the thermoelectric battery. This circumstance reduces the cooling efficiency, requires additional costs of electricity and thermoelectric material to compensate for losses in overcoming thermal resistance of heat transitions.

 The aim of the invention is to remedy this drawback.

 To achieve this goal, the proposed device design, shown in the drawing.

 The device comprises a cascade thermoelectric battery consisting of a basic thermoelectric battery 1 constituting the lower base cascade, and additional thermoelectric batteries 2 forming the upper cascades. The basic thermoelectric battery is made of thermocouples with branches of various heights. Thermoelements with branches of the greatest height are brought in by heat-absorbing junctions in thermal contact with the electronic board 3 with heat-generating elements 4, additional thermoelectric batteries 2 are placed on the heat-absorbing junctions of thermoelements with branches of lower height 2. The cascade thermoelectric battery is made in such a way that the heat-absorbing junctions of thermoelements of the base stage 1 with the largest the branches are at the same level as the heat-absorbing junctions of the end cascades of additional thermoelectric batts Rey 2. Heat removal from fuel thermoelectric junctions cascaded battery produced heat exchanger 5, and its electric power energy - the source of direct electric current 6.

 The principle of operation of the device is to organize uneven heat removal from the elements of the electronic board, in which the cooling of the fuel elements is carried out with unequal intensity depending on the level of heat generated by them. The heat sink system is organized in such a way that heat is removed from the most heat-generating elements of the electronic board by the most “cold” cascades of the thermoelectric battery, heat is removed from less heat-generating elements by the less “cold” cascades, etc. With this approach, the most heat-generating elements of the electronic board are placed on cascades of a thermoelectric battery with a higher level of cooling, elements with lower heat emissions are located on cascades with a lower level of cooling.

 The device operates as follows.

 The basic thermoelectric battery 1, designed to provide a given temperature regime for the areas of the electronic circuit board 3 with heat-generating elements 4 having the lowest dissipation power, sets a certain initial level of cooling of the electronic circuit board. Additional thermoelectric batteries 2, forming the upper cascades located under the heat-generating elements 4 of the electronic board 3 with high dissipation powers, organize additional heat removal, the value of which is determined in accordance with the dissipation power level of a specific heat-generating element 4. Heat is removed from the heat-generating junctions of the cascade thermoelectric battery by a heat exchanger 5, which, depending on the level of power output, can be air or liquid. The cascades of the thermoelectric battery are powered by a constant current source 6 in parallel or in series.

 The design of the cooling device will improve the cooling efficiency of electronic circuit boards by eliminating heat transfers that create additional thermal resistance between the electronic circuit board and the junctions of the cascade thermoelectric battery.

Literature
1. Pat. 2174292, H 05 K 7/20, G 05 D 23/30. A device for heat removal and thermal stabilization of electronic boards / T.A. Ismailov, O.V. Evdulov, G.I. Aminov, Sh.A. Yusufov (RF) - 2000123233; Claim 09/07/2000; Publ. 09/27/2001, Bull. 27. - 4 p.

Claims (1)

 A device for cooling electronic circuit boards containing a cascade thermoelectric battery that organizes uneven cooling and consists of a lower base cascade and upper additional cascades, a heat exchanger, characterized in that the base thermoelectric battery is made of thermocouples with branches of different heights, it contains thermocouples with branches of the highest height heat-absorbing junctions in thermal contact with the electronic board with heat-generating elements, and on heat-absorbing junctions of thermoelements with additional thermoelectric batteries are placed with smaller heights; moreover, the heat-absorbing junctions of the thermoelements of the base cascade with the highest branch heights are on the same level as the heat-absorbing junctions of the terminal cascades of additional thermoelectric batteries, the heat is removed from the heat-generating junctions by the cascade thermoelectric battery, and it is supplied with electric energy by a constant source electric current.